Correct Answer - A::D
In the upward journey resistance due to air will be in downward direction.While in downward motion resistance will be upwards.Therefore, `t_(1)` will decrease, while `t_(2)` will increase.Hence, `T=t_(1)+t_(2)` may increase or decrease.`H` will decrease.In horizontal direction air resistance is opposite to the motion.Therefore, `R_(1)` will decrease while `R_(2)` may decrease or increase.